FR2912431A1 - FLOOR COATING WITH DUAL REINFORCABLE FRAME. - Google Patents

Abstract

This floor covering with double roll-up reinforcement comprises, on the opposite side, a calendered sheet (1) of predetermined thickness, a first reinforcement (5), a layer of foam (3) and a second reinforcement (4) in the opposite face, characterized in that the first frame (5) consists of a single grid excluding any addition of nonwoven polyester textile web and the like.

Description

FLOOR COATING WITH DOUBLE ROLL-UP FRAME

  The invention relates to the technical field of flooring comprising a double reinforcement stiffening and windable. These reinforcements are of the type made of a sheet of nonwoven polyester material.

  Originally and with reference to FIG. 1, the coating (R1) is of the type comprising a sheet of controlled thickness -ypically from 0.5 to 3 mm-of a Shore A hardness of between 60 and 90 produced by known techniques for the transformation of thermoplastic polymers: coating; calendering; extrusion. Preferably, the polymer used is plasticized PVC but any other thermoplastic polymer is usable. The coating includes on its reverse side an armature (2) consisting of a polyester nonwoven bonded to a glass grid. Specifically, the nonwoven has a weight of 15 to 40g / m2 preferably 25g / m2 and the glass grid is made of glass son. These have a title of 34 or 68 tex distributed according to a contexture varying from 1 * 1 to 5 * 5 threads to cm in warp and weft with all possible non-symmetrical possible combinations. The coating includes a foam (3) to be bonded to the floor. This foam is PVC but any other thermoplastic polymer is usable. The thicknesses of foam range from 1 to 10 mm and preferably from 3 to 8 mm.

  A new regulation DTU 13.3 has required to eliminate all possibilities of disposing of the back material and solidarity with the foam a nonwoven back that may allow the use of moisture-resistant glues impossible to use with a back not coated with a nonwoven. The explanation is that the adhesion of moisture-resistant adhesives (PU 2 components or PU / Epoxy 2 components for example) have a very low adhesion on plasticized PVC. On the other hand, they have no tack which makes laying the coating impossible.

  To meet this regulatory constraint, the solution was therefore to have upside down coating material a nonwoven back which can form a screen with the part of the coating and absorb the penetration of glue.

  In the case of thin materials and without foam underlayer, the problem is easily solved by lamination of a nonwoven structure on the underside of the surface material.

  On the other hand, for materials with foam underlayer, a first difficulty encountered arises from the fact that the thickness of the foam prevents or hinders the bending of the material by the bimetallic effect of the two reinforcements. With reference to FIG. 2 of the drawings, the coating (R2) corresponding to this definition comprises a calendered sheet (1) in one or more thicknesses, a structure of the type described for the coating (R1) by adding thereto a second reinforcement (4) of nonwoven polyester material of the same type with a grid (4a) and a nonwoven web (4b) of polyester.

  A problem posed by this type of coating lies in the fact that the double bimetallic reinforcement prevents the homogeneous winding of the coating. FIG. 2A thus shows the coating (R2) of FIG. 2 in the winding phase, that is to say with a curved shape, and it has been found on the first armature (2) a fracture situation and / or breaking the nonwoven (2b) from these fibers with respect to the grid (2a). Figure 2B shows the appearance resulting from the unrolled coating with the appearance of defects (2c) on the apparent face location due to the torn nonwoven. The deteriorated aesthetic is no longer acceptable to the consumer. The traction exerted on the nonwoven part of the first reinforcement during winding causes the fibers to tear. There is thus a double disadvantage of difficulties of winding the coating on itself which causes the same rupture of one of the frames with the loss of the aesthetics of the product.

  The Applicant's approach has therefore been to seek to remedy these drawbacks.

  In practice, and initially, tests have been carried out taking into account the variation in thickness of the various components of the coating, thus trying to improve the constitution of the first reinforcement. The results were not satisfactory, the disadvantages remaining to varying degrees. The difficulty to solve was to design a coating that answers the problems, but is designed with a double frame to meet the standard DTU 13.3. The Applicant's approach was then to examine the winding conditions and the physical phenomena resulting therefrom.

  It is therefore on the basis of this problem and of the aforementioned step that the Applicant has thought of modifying the structure of the first reinforcement of the coating, while retaining its principle in combination with the second reinforcement to implement the solution of Thus, the floor covering according to the invention, of the type comprising in the front face a calendered sheet of determined thickness, a first frame, a layer of foam and a second armature face-up, and is remarkable in that the first frame is constituted by a single grid excluding any addition of nonwoven polyester textile web and the like.

  The solution provided as defined perfectly meets the initial objectives with respect to the prior art. The tests have demonstrated the constitution of a double armature coating and foam underlayment easily rolled up and without compromising the quality of its aesthetic visual appearance on its face.

  These and other characteristics will be apparent from the rest of the description. For fixing the object of the invention illustrated in a non-limiting manner to the figures of the drawings in which: - Figure 1 is a sectional view of the structure of a coating (R1) soil according to the prior art. FIG 2 is a sectional view of a coating (R1) of double reinforcement ground according to the prior art. - Figure 2A shows the coating (R2) of Figure 2 in a winding situation with the breaking effect of the first armature. - Figure 2B shows the coating (R2) of Figure 2A after unwinding with appearance of unsightly effect. - Figure 3 shows in section the coating (R3) of Figure 3 in the winding situation. - Figure 3B shows the coating (R3) of Figure 3A unwrapped. FIG. 4 is a graph illustrating the elongation capacity with respect to the tensile force exerted on the first reinforcement formed on the one hand according to FIG. 2, and on the other hand according to FIG. 3.

  In order to make the object of the invention more concrete, it is now described in a nonlimiting manner illustrated in the figures of the drawings.

  Referring to FIGS. 3, 3A, 3B, the coating (R3) is of the type comprising a calendered sheet (1) of predetermined thickness, a first reinforcement (5), a foam layer (3), a second reinforcement ( 4) constituted by a grid (4a) and a nonwoven textile web (4b) of polyester material for example.

  According to the invention, the first armature (5) consists exclusively of a glass grid and does not include other components such as the nonwoven textile web.

  Thus, the coating according to the invention is rollable despite the bimetallic effect due to the two frames. The glass grid (5) which ensures the stability of the coating has a modulus of elasticity very high compared to the second frame including the nonwoven web of back which brings and allows the junction with the glue. Therefore, the coating is rollable without difficulty and without harming its aesthetics.

  In practice, the solution provided by the invention is explained by the graph of Figure 4 in which the abscissa is mentioned the parameter of the elongation and ordinate that of the traction. It is noted after representation of the elongation graph of the first frame (2) constituted by the glass grid and the nonwoven textile web a proportional and regular elongation. This is due to the close bonding of the two components which give rise to uniform elongation, but due to the stresses exerted on the nonwoven textile web cause the fibers to break.

  On the contrary, and according to the invention, the first armature (5) consisting of the single glass grid undergoes the phenomenon of elongation according to its only parameters. On the traction elongation graph, two zones with different slopes can be distinguished. The first zone corresponds to the stresses (traction or compression) exerted between the reinforcements with sufficient elongations to avoid the phenomenon of breaks.

  Here is some indication of the thickness of the components. The calendered sheet with one or more layers may have a thickness of the order of 1 to 4 mm without limitation. The foam layer may be from 1 to 10 mm thick, preferably from 3 to 8 mm thick. The first armature (5) consists of a glass grid consisting of glass threads of title 34 to 68 Tex distributed according to a conventional warp frame geometry ranging from 1 * 1 to 5 * 5 threads per cm with all possible combinations between these limits only 3 * 3 34 Tex or 1.5 * 1.5 68 Tex. The second reinforcement (4) consists of a polyester nonwoven of 60 to 120 g / m2 spun bonded type.

  The advantages are apparent from the invention. The unexpected solution to solve the problem of getting rid of one of the components of the first frame provides immediate benefits, without destroying the intrinsic qualities of the coating given by its components and without changing its aesthetics.

Claims (1)

  -1- Rollable double reinforcement floor covering, of the type comprising, on the front face, a calendered sheet (1) of predetermined thickness, a first reinforcement (5), a layer of foam (3) and a second reinforcement (4) made of face-up, characterized in that the first reinforcement (5) consists of a single grid excluding any addition of non-woven polyester textile web and the like.